Safety - Section 20 08/11 OM2036 Page 20-16 WHEN REPAIRS ARE NECESSARY 1. Only qualified maintenance personnel, who understand the systems being repaired, must attempt repairs. 9. If the truck is to be towed for any reason, use a rigid tow bar. Check the truck cab for decals for special towing precautions. Refer to Section 30, Operating Instructions - Towing. 2. Many components on the Komatsu truck are large and heavy. Ensure that the lifting equip- ment - hoists, slings, chains, lifting eyes - are of adequate capacity. 10. Drain, clean, and ventilate the fuel tanks and/or hydraulic tanks before welding. NOTE:
If it is necessary to weld the hydraulic tank or fuel tank, drain, clean, and ventilate the tank(s) before welding. 3. DO NOT stand under a suspended load. DO NOT work under the raised body unless the body safety cable is in place to hold the body in the up position. 4. DO NOT service the truck while the engine is on, except when absolutely necessary. Keep a safe distance from moving parts. 5. When servicing the air conditioning system, wear a face shield and cold-resistant gloves for protection against frostbite. Follow all current regulations for handling and recycling refriger- ants. Pressurized hydraulic fluid may penetrate the skin.
Serious injury and possibly death may result if the proper medical treatment by a physi- cian familiar with this injury is not received immediately. 11. Relieve system pressure before disconnecting hoses or components. 6. Follow the package directions carefully when using cleaning solvents. 12. After adjustments or repairs, replace all shields, screens, and clamps. 7. If an auxiliary battery assist is needed, first use one cable to connect the 24V positive (+) post of the disabled truck batteries to the 24V posi- tive (+) post of the auxiliary assist.
Use the sec- ond cable to connect the 24V negative (-) post of the auxiliary assist battery to a frame ground (-) on the disabled truck away from the battery. 13. Working near tires can be dangerous. Use extreme caution when working around tires. Refer to Tires earlier in this chapter. 14. Only a qualified operator may operate the truck in the repair facility or during road testing. 8. Disconnect the positive and negative battery cables before arc welding on the truck. Failure to do so may seriously damage the battery and the electrical equipment. Disconnect the battery charging alternator lead wire and isolate the elec- tronic control components before making the welding repairs.
It is not necessary to disconnect or remove any control circuit cards or any of the Alarm Indicating Device (AID) circuit control cards. Fasten the welding machine ground (-) lead to the piece being welded; the grounding clamp must be attached as near as possible to the weld area. DO NOT allow welding current to pass through the ball bearings, roller bearings, suspensions, or hydraulic cylinders. Avoid lay- ing the welding cables over or near the vehicle electrical harnesses. The welding voltage could be induced into the electrical harness and cause damage to the components.